单项选择题

When were the images of Mars taken

A．In the middle of summer on Earth.
B．In the middle of summer on Mars.
C．In the middle of summer on Earth's polar caps.
D．In the middle of summer in the northern part of Mars.

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单项选择题

What's the purpose of the conference

A．To give students a chance to debate international affairs and to mirror the real life business of the UN.
B．To enlarge students' fields of vision.
C．To learn about other cultures.
D．To learn about how to portray their own.

单项选择题

According to the speaker, My Experiences in Washington will deal with ______.

A．secret documents never before released to the public
B．an "insider's" conceptualization of the government's failures
C．his personal view of that presidential era
D．the administrative problems of the president